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[https://en.wikipedia.org/wiki/Ayurveda Ayurveda] accepts separate existence of ''indriya'' (sense organs). ''Indriya'' are made up of the five ''mahabhutas''. Each ''indriya'' is composed of portions of all five ''mahabhutas'', with predominance of one of them. Accepting separate existence of ''indriya'' and understanding their composition as made up of ''mahabhutas'' is a significant concept philosophically, and also having important practical applications. Each ''indriya'' operates with the help of certain organs and structures called as ''adhishthana'' (substratum). E.g. eyes, specially retina, optic nerve and the centre for vision in the brain, all can be termed as ''adhishthana''. There is separate existence of ''indriya'', which is very subtle and therefore invisible. Since all these are made up of ''mahabhutas'', with specific diet and specific medicines they can be treated. This is because food and medicines(drugs) are also made up of ''mahabhutas''. Subtle portion from food nourishes ''indriyas'', and medicines can influence and regularise their functions. One can realise, that even the conditions pertaining to ''adhishthana'' like optic nerve degeneration are very much difficult to treat, so one can imagine about the conditions related to ''indriya''. But with acceptance of ''indriya'' and understanding their composition by ''mahabhutas'' provides scope to treat conditions not only pertaining to ''adhishthana'', but also ''indriya''.

[https://en.wikipedia.org/wiki/Ayurveda Ayurveda] accepts separate existence of ''indriya'' (sense organs). ''Indriya'' are made up of the five ''mahabhutas''. Each ''indriya'' is composed of portions of all five ''mahabhutas'', with predominance of one of them. Accepting separate existence of ''indriya'' and understanding their composition as made up of ''mahabhutas'' is a significant concept philosophically, and also having important practical applications. Each ''indriya'' operates with the help of certain organs and structures called as ''adhishthana'' (substratum). E.g. eyes, specially retina, optic nerve and the centre for vision in the brain, all can be termed as ''adhishthana''. There is separate existence of ''indriya'', which is very subtle and therefore invisible. Since all these are made up of ''mahabhutas'', with specific diet and specific medicines they can be treated. This is because food and medicines(drugs) are also made up of ''mahabhutas''. Subtle portion from food nourishes ''indriyas'', and medicines can influence and regularise their functions. One can realise, that even the conditions pertaining to ''adhishthana'' like optic nerve degeneration are very much difficult to treat, so one can imagine about the conditions related to ''indriya''. But with acceptance of ''indriya'' and understanding their composition by ''mahabhutas'' provides scope to treat conditions not only pertaining to ''adhishthana'', but also ''indriya''.

Similarly accepting separate existence of ''mana'' (mind) is also significant. Because not only by correcting the higher functions of brain which are attributed to mind, but by directly acting on mind, Ayurveda provides better scope for it’s treatment. Accepting existence of atma (soul) is again very much significant. Buddhi (intelligence), smriti (memory) etc. are attributes of atma. By accepting separate existence of atma, they can be better understood and treated to improve.

Similarly accepting separate existence of ''mana'' (mind) is also significant. Because not only by correcting the higher functions of brain which are attributed to mind, but by directly acting on mind, [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] provides better scope for it’s treatment. Accepting existence of atma (soul) is again very much significant. ''Buddhi'' (intelligence), ''smriti'' (memory) etc. are attributes of ''atma''. By accepting separate existence of ''atma'', they can be better understood and treated to improve.

Atma along with the subtle indriyas and mana when enters in the union of sperm and ovum, ayu(life) starts. Even after in vivo fertilisation of ovum with advanced procedures like ICSI, sometimes new life may not be started. As per Ayurveda, it can be understood that atma has not entered in that union. The conjugation of four factors i.e. the body and atma which enters in it with indriya and mana, continues till death. At the time of death, atma along with indriya and mana leaves the body. When atma realises that it is distinct from the body, indriya and mana, it gets moksha (emancipation).

''Atma'' along with the subtle ''indriyas'' and ''mana'' when enters in the union of sperm and ovum, ''ayu''(life) starts. Even after in vivo fertilisation of ovum with advanced procedures like ICSI, sometimes new life may not be started. As per [https://en.wikipedia.org/wiki/Ayurveda Ayurveda], it can be understood that ''atma'' has not entered in that union. The conjugation of four factors i.e. the body and ''atma'' which enters in it with ''indriya'' and ''mana'', continues till death. At the time of death, ''atma'' along with ''indriya'' and ''mana'' leaves the body. When ''atma'' realises that it is distinct from the body, ''indriya'' and ''mana'', it gets ''moksha'' (emancipation).

====Synonyms of ''Ayu''(life)====

====Synonyms of ''Ayu''(life)====

''Ayu'' is described with various synonyms. Each one of them is significant and they provide understanding about different aspects about ''Ayu''. Its synonym, ''dhari'' (the support), indicates that as long as the conjugation of these four factors continues, the living body is protected. Any threat to the existence is counteracted by protective mechanisms like the healing of wounds. As soon as there is a disjunction of these factors, death occurs and the decomposition of body starts. Jeevitam (animation) suggests that only as long as the conjugation of these factors continues, there is liveliness, responsive and sentient nature. This is lost as soon as there is disjunction. Nityaga (the flux) suggests that this conjugation of four factors is a dynamic process, a continuum. The living body keeps on undergoing changes, at every moment. ''Anubandha'' (the link) suggests that this conjugation is continued as a link every moment. It also forms a link at its beginning point with the previous life, and at the end point, with the next life.

''Ayu'' is described with various synonyms. Each one of them is significant and they provide understanding about different aspects about ''Ayu''. Its synonym, ''dhari'' (the support), indicates that as long as the conjugation of these four factors continues, the living body is protected. Any threat to the existence is counteracted by protective mechanisms like the healing of wounds. As soon as there is a disjunction of these factors, death occurs and the decomposition of body starts. ''Jeevitam'' (animation) suggests that only as long as the conjugation of these factors continues, there is liveliness, responsive and sentient nature. This is lost as soon as there is disjunction. ''Nityaga'' (the flux) suggests that this conjugation of four factors is a dynamic process, a continuum. The living body keeps on undergoing changes, at every moment. ''Anubandha'' (the link) suggests that this conjugation is continued as a link every moment. It also forms a link at its beginning point with the previous life, and at the end point, with the next life.

* Superiority of [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] over other ''vedas'': Certain branches of ''veda'' like ''Dhanurveda'' (pertaining to knowledge of archery and war technology) are beneficial for the present life. Where as certain portions like ''upanishada'' and ''aranyaka'' are beneficial for the life after death. But [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] is beneficial not only for this life, but for the other life also. By providing sound health, it is beneficial for present life. With sound health only it’s possible to perform specific rituals and good acts, which may lead to better life after death. Also with sound health only it is possible to make efforts to acquire the supreme knowledge which will lead to emancipation.

* Superiority of [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] over other ''vedas'': Certain branches of ''veda'' like ''Dhanurveda'' (pertaining to knowledge of archery and war technology) are beneficial for the present life. Where as certain portions like ''upanishada'' and ''aranyaka'' are beneficial for the life after death. But [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] is beneficial not only for this life, but for the other life also. By providing sound health, it is beneficial for present life. With sound health only it’s possible to perform specific rituals and good acts, which may lead to better life after death. Also with sound health only it is possible to make efforts to acquire the supreme knowledge which will lead to emancipation.

* Theory of ''samanya'' and ''vishesha''- ''Samanya'' and ''vishesha'' are pertaining to ''dravya'', ''guna'' and ''karma''. E.g. when a person observes a white pen, there is a process involved in this understanding. The light emitted by that pen reaches the eyes. This sensation is conducted to the centre in the brain through ''indriya'' (sense organ). This happens in the presence of mind. We know that an absent minded person may not pay attention to this pen. The mind processes the information and analyses it, based on which the ''buddhi'' (intelligence), which is an attribute of the ''atma'' (soul), takes a decision about the nature of the object and on whether it is beneficial or not. This process is called as ''jnanotpatti'' (manifestation of knowledge). When we see another white pen, the same procedure is repeated and we understand that it also a white pen. We observe two white pens, and understand that they are similar. This is refered in the verse 45 as ''ekatva'' (similarity). How do we understand this similarity? It is said that both these white pens have an inherent principle called ''samanya'' which helps us to understand similarity (''samanyam ekatvakaram''). When we observe a black pen, we understand the distinction between it and the white pen. It is said that both of them contained a principle ‘vishesha’ due to which we understood the dissimilarity, distinction (''prithaktvakrita''). This is the brief essence of the principle of ''Samanya-vishesha''. This concept is also found in ''vaisheshika darshana'' (a school of Indian philosophy). Many other schools of philosophy have discussed it, but [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] has applied this concept in practice.

* Theory of ''samanya'' and ''vishesha''- ''Samanya'' and ''vishesha'' are pertaining to ''dravya'', ''guna'' and ''karma''. E.g. when a person observes a white pen, there is a process involved in this understanding. The light emitted by that pen reaches the eyes. This sensation is conducted to the centre in the brain through ''indriya'' (sense organ). This happens in the presence of mind. We know that an absent minded person may not pay attention to this pen. The mind processes the information and analyses it, based on which the ''buddhi'' (intelligence), which is an attribute of the ''atma'' (soul), takes a decision about the nature of the object and on whether it is beneficial or not. This process is called as ''jnanotpatti'' (manifestation of knowledge). When we see another white pen, the same procedure is repeated and we understand that it also a white pen. We observe two white pens, and understand that they are similar. This is refered in the verse 45 as ''ekatva'' (similarity). How do we understand this similarity? It is said that both these white pens have an inherent principle called ''samanya'' which helps us to understand similarity (''samanyam ekatvakaram''). When we observe a black pen, we understand the distinction between it and the white pen. It is said that both of them contained a principle ''vishesha'' due to which we understood the dissimilarity, distinction (''prithaktvakrita''). This is the brief essence of the principle of ''Samanya-vishesha''. This concept is also found in ''vaisheshika darshana'' (a school of Indian philosophy). Many other schools of philosophy have discussed it, but [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] has applied this concept in practice.

* Continuous use of ''dravya'', ''guna'' or ''karma'' which are similar to the body constituents, results in the increase of them. Whereas, continuous use of dissimilar ''dravya, guna'' and ''karma'', result in the decrease of them/ e.g. eating the meat of animals causes an increase in the content of muscle tissue in the human body (''dravya samanya''). But not only this, eating of other food articles like ''masha'' (black gram) also results in an increase of muscle tissue. This happens because of the properties present in ''masha'' like ''guru'', ''picchila'', ''sthira'' etc. are similar to that of muscle tissue, although muscle tissue and black gram are different materials (''guna samanya''). Also, activities like rest and proper sleep induce similar properties like sthira, guru etc. which help in increase in muscle tissue (''Karma samanya)''.  

* Continuous use of ''dravya'', ''guna'' or ''karma'' which are similar to the body constituents, results in the increase of them. Whereas, continuous use of dissimilar ''dravya, guna'' and ''karma'', result in the decrease of them/ e.g. eating the meat of animals causes an increase in the content of muscle tissue in the human body (''dravya samanya''). But not only this, eating of other food articles like ''masha'' (black gram) also results in an increase of muscle tissue. This happens because of the properties present in ''masha'' like ''guru'', ''picchila'', ''sthira'' etc. are similar to that of muscle tissue, although muscle tissue and black gram are different materials (''guna samanya''). Also, activities like rest and proper sleep induce similar properties like sthira, guru etc. which help in increase in muscle tissue (''Karma samanya'').  

* These effects on the body of ''dravya, guna'' and ''karma'' having ''samanya'' and ''vishesha'' can be exerted only when they are applied directly to the body (''pravrittih ubhayasya''). Also when we use any ''dravya, guna'' or ''karma, samanya'' and ''vishesha'' both come to action, with respect to different body constituents. E.g. ''Maricha'' (black pepper) decreases ''kapha'' and ''vata'', but at the same time increases ''pitta''. While using food or medicines, we must understand that it will be favorable to certain body constituents, but at the same time it will be unfavorable to other constituents (''ubhayasya pravrittih''). The effects are like double edged sword. By keeping this in mind one should make appropriate use of food or medicines.

* These effects on the body of ''dravya, guna'' and ''karma'' having ''samanya'' and ''vishesha'' can be exerted only when they are applied directly to the body (''pravrittih ubhayasya''). Also when we use any ''dravya, guna'' or ''karma, samanya'' and ''vishesha'' both come to action, with respect to different body constituents. E.g. ''Maricha'' (black pepper) decreases ''kapha'' and ''vata'', but at the same time increases ''pitta''. While using food or medicines, we must understand that it will be favorable to certain body constituents, but at the same time it will be unfavorable to other constituents (''ubhayasya pravrittih''). The effects are like double edged sword. By keeping this in mind one should make appropriate use of food or medicines.

* Basic elements- All the objects can be classified as animate and inanimate. The basis for this classification is not presence or absence of ''atma'' (soul) in specific objects. Because ''atma'' is described as ''vibhu'' (ubiquitous, i.e. present everywhere). But the presence of ''atma'' is manifested through sense organs. Therefore, presence or absence of ''indriya'' (sense organs) is taken as the base for classification of animate and inanimate objects. Sense organs here do not refer to only externally known organs like eyes, ears etc. ''Indriya'' are subtle and therefore imperceptible entities. Externally known organs like eyes, ears etc. are just their tools. E.g. plants do not exhibit external sensory organs like eyes etc., but they have all the sensations which are realised by subtle ''indriya'' present internally. It is significant to note that it was known to ancient Indians, and also to ''Ayurvedic'' physicians specially, that plants do possess sensations like photosensitivity, auditory, taste, olfactory and tactile sensation i.e. all five sensations [verse 48]  

* Basic elements- All the objects can be classified as animate and inanimate. The basis for this classification is not presence or absence of ''atma'' (soul) in specific objects. Because ''atma'' is described as ''vibhu'' (ubiquitous, i.e. present everywhere). But the presence of ''atma'' is manifested through sense organs. Therefore, presence or absence of ''indriya'' (sense organs) is taken as the base for classification of animate and inanimate objects. Sense organs here do not refer to only externally known organs like eyes, ears etc. ''Indriya'' are subtle and therefore imperceptible entities. Externally known organs like eyes, ears etc. are just their tools. E.g. plants do not exhibit external sensory organs like eyes etc., but they have all the sensations which are realised by subtle ''indriya'' present internally. It is significant to note that it was known to ancient Indians, and also to ''Ayurvedic'' physicians specially, that plants do possess sensations like photosensitivity, auditory, taste, olfactory and tactile sensation i.e. all five sensations [verse 48]  

* Out of the 41 ''guna'' mentioned here, ''shabda'' (sound), ''sparsha'' (touch), ''rupa'' (appearance- shape, colour, etc.), ''rasa'' (taste), ''gandha'' (smell) are termed as ''artha'', because they are the objects of senses. They are specialised characteristics of particular ''mahabhutas''. ''Guru'' etc. ''guna'' are in the form of 10 pairs of opposite characteristics. These are the ''guna'' present in the tissues of living body, therefore they are called as ''sharira'' (pertaining to body) ''guna''.  They are also present in the food articles and drugs. They manifest in an object, because of specific composition of ''mahabhutas''. Therefore, they are termed as ''bhautika'' (pertaining to ''bhutas''). ''Ichcha'' (desire), ''buddhi'' (including intellect, power of resolution, memory, awareness, sense of ego), ''dvesha'' (hatred), ''sukha'' (pleasure), ''dukkha'' (pain), and ''prayatna'' (effort) are six ''guna'' that are termed as ''atma guna'' (attributes of soul). ''Para'' and ten other properties are very much important in formulating treatment, hence termed as ''chikitsya guna''.

* Out of the 41 ''guna'' mentioned here, ''shabda'' (sound), ''sparsha'' (touch), ''rupa'' (appearance- shape, colour, etc.), ''rasa'' (taste), ''gandha'' (smell) are termed as ''artha'', because they are the objects of senses. They are specialised characteristics of particular ''mahabhutas''. ''Guru'' etc. ''guna'' are in the form of 10 pairs of opposite characteristics. These are the ''guna'' present in the tissues of living body, therefore they are called as ''sharira'' (pertaining to body) ''guna''.  They are also present in the food articles and drugs. They manifest in an object, because of specific composition of ''mahabhutas''. Therefore, they are termed as ''bhautika'' (pertaining to ''bhutas''). ''Ichcha'' (desire), ''buddhi'' (including intellect, power of resolution, memory, awareness, sense of ego), ''dvesha'' (hatred), ''sukha'' (pleasure), ''dukkha'' (pain), and ''prayatna'' (effort) are six ''guna'' that are termed as ''atma guna'' (attributes of soul). ''Para'' and ten other properties are very much important in formulating treatment, hence termed as ''chikitsya guna''.

* ''Atma'' (soul) is ubiquitous. ''Prayatna'' (effort) is described as an attribute of ''atma''. An action is initiated in the presence of ''atma''. It is said that the attribute ''prayatna'' (effort) provides initiation for the action. The term ''karma'' is also used in different other sense elsewhere. E.g. it refers to [[Panchakarma]] (five specific therapies for purification of the body) and ''purvakarma'' (previous deeds of a person). To differentiate the term ''karma'' here, the word ''cheshtitam'' is used. By using the word, it is clarified that here this word is used in the sense of movements.  

* ''Atma'' (soul) is ubiquitous. ''Prayatna'' (effort) is described as an attribute of ''atma''. An action is initiated in the presence of ''atma''. It is said that the attribute ''prayatna'' (effort) provides initiation for the action. The term ''karma'' is also used in different other sense elsewhere. E.g. it refers to [[Panchakarma]] (five specific therapies for purification of the body) and ''purvakarma'' (previous deeds of a person). To differentiate the term ''karma'' here, the word ''cheshtitam'' is used. By using the word, it is clarified that here this word is used in the sense of movements.  

* ''Samavaya'' (Inseparable concomitance)- ''Samavaya''  is the inherent inseparable concomitance of ''prithvi'' etc. (''dravya)'' with their ''guṇas'' (properties) and ''karma'' (actions).  This relationship is inseparable, because ''dravya'' and ''guna-karma'' evolve together. If a ''dravya'' is destroyed, ''guna-karma'' cannot exist and vice a versa. ''Dravya, guna-karma'' evolve and get destroyed, and are replaced by newer ones, but their relationship never changes. Whenever a ''dravya'' exists, it is never devoid of ''guna-karma''. In this sense, it is said that ''samavaya'' is eternal. Out of the six categories of existants, ''dravya, guna'' and ''karma'' actually exist. But if their mutual relationship is not there, none of them can exist. Therefore, ''samavaya'' is the base of existance for everything. [ verse 50]   

* ''Samavaya'' (Inseparable concomitance)- ''Samavaya''  is the inherent inseparable concomitance of ''prithvi'' etc. (''dravya)'' with their ''guṇas'' (properties) and ''karma'' (actions).  This relationship is inseparable, because ''dravya'' and ''guna-karma'' evolve together. If a ''dravya'' is destroyed, ''guna-karma'' cannot exist and vice a versa. ''Dravya, guna-karma'' evolve and get destroyed, and are replaced by newer ones, but their relationship never changes. Whenever a ''dravya'' exists, it is never devoid of ''guna-karma''. In this sense, it is said that ''samavaya'' is eternal. Out of the six categories of existants, ''dravya, guna'' and ''karma'' actually exist. But if their mutual relationship is not there, none of them can exist. Therefore, ''samavaya'' is the base of existance for everything. [ verse 50]   

* ''Dosha''- The present universe is composed of five ''mahabhutas''. When we observe various activities and functions in the human body and the external world, it is understood that functionally, five ''mahabhutas'' form three groups. Functions of ''prithvi'' and ''apa'' are complementary to each other and they work together. Same way ''akasha'' and ''vayu'' form a group. ''Agni'' keeps balance in these two groups. In the external world and in the living body, we can classify all the activities and functions grossly in three groups. On one hand we find functions like evolution of the universe and various objects, new creations, birth in case of living beings, growth and development, augmentation of existing structures and tissues, conjunction- conglomeration and unions required for this, synthesis, anabolism, impletion, nourishment. On the other hand we observe depletion of existing structures and tissues, dissociation or disjunction, division, catabolism, dessication, reduction, destruction and annihilation of existing structures, death in case of living beings and dissolution of the universe. For all these functions various movements are required which form the third group. These three kinds of functions are termed as ''visarga''(producing/creating), ''adana''(reducing/taking away) and ''vikshepa''(moving). These activities are performed by the group of ''prithvi''- ''apa, agni'' and ''akasha-vayu'' respectively. In the external world and in the living body we find these activities are going on in a controlled and guided manner, systematically. Therefore, there must be some principles of the universe which control them. These are ''Soma'' (''Chandra'' or Moon)- ''Surya'' (''Agni'', fire or Sun) and ''Anila'' (Vayu or Air). In the living body also such activities are going on in a coordinated, systematic, controlled and guided manner. The body constituents which govern them are representatives of ''Soma-Surya-Anila''. They are called as ''kapha, pitta'' and ''vata'' respectively. They are called as the three ''doshas''. [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] studies and understands all the normal and abnormal activities in the human body in terms of the three ''doshas''. This system of three ''doshas'', is very important practically for each physician. A physician having average knowledge also can make use of this system for successfull treatment. While a physician having in depth knowledge can use the same system to understand minute details, due to which his treatment will become precise and therefore providing quicker and better success. The theory of three ''doshas'' i.e. ''Tridosha'' is very much important to understand [https://en.wikipedia.org/wiki/Ayurveda Ayurveda].

* ''Dosha''- The present universe is composed of five ''mahabhutas''. When we observe various activities and functions in the human body and the external world, it is understood that functionally, five ''mahabhutas'' form three groups. Functions of ''prithvi'' and ''apa'' are complementary to each other and they work together. Same way ''akasha'' and ''vayu'' form a group. ''Agni'' keeps balance in these two groups. In the external world and in the living body, we can classify all the activities and functions grossly in three groups. On one hand we find functions like evolution of the universe and various objects, new creations, birth in case of living beings, growth and development, augmentation of existing structures and tissues, conjunction- conglomeration and unions required for this, synthesis, anabolism, impletion, nourishment. On the other hand we observe depletion of existing structures and tissues, dissociation or disjunction, division, catabolism, dessication, reduction, destruction and annihilation of existing structures, death in case of living beings and dissolution of the universe. For all these functions various movements are required which form the third group. These three kinds of functions are termed as ''visarga''(producing/creating), ''adana''(reducing/taking away) and ''vikshepa''(moving). These activities are performed by the group of ''prithvi''- ''apa, agni'' and ''akasha-vayu'' respectively. In the external world and in the living body we find these activities are going on in a controlled and guided manner, systematically. Therefore, there must be some principles of the universe which control them. These are ''Soma'' (''Chandra'' or Moon)- ''Surya'' (''Agni'', fire or Sun) and ''Anila'' (Vayu or Air). In the living body also such activities are going on in a coordinated, systematic, controlled and guided manner. The body constituents which govern them are representatives of ''Soma-Surya-Anila''. They are called as ''kapha, pitta'' and ''vata'' respectively. They are called as the three ''doshas''. [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] studies and understands all the normal and abnormal activities in the human body in terms of the three ''doshas''. This system of three ''doshas'', is very important practically for each physician. A physician having average knowledge also can make use of this system for successfull treatment. While a physician having in depth knowledge can use the same system to understand minute details, due to which his treatment will become precise and therefore providing quicker and better success. The theory of three ''doshas'' i.e. ''Tridosha'' is very much important to understand [https://en.wikipedia.org/wiki/Ayurveda Ayurveda].

''Rasa'' [taste sensations]: Every ''dravya'' in the present universe is composed of specific mode of conjugation of all five ''mahabhutas''. ''Rasa'' (taste) is a specialized property of ''apa mahabhuta''. When ''apa mahabhuta'' is in ''tanmatra'' (purest unconjugated form) state, it does not possess taste. When it comes in contact with ''prithvi'', the taste is formed.  The variation in manifestation of six tastes like sweet, sour, salty, pungent, bitter and astringent is due to combination of other three ''mahabhuta'' like ''akasha, vayu'' and ''tejas''. [verse 64]  

''Rasa'' [taste sensations]: Every ''dravya'' in the present universe is composed of specific mode of conjugation of all five ''mahabhutas''. ''Rasa'' (taste) is a specialized property of ''apa mahabhuta''. When ''apa mahabhuta'' is in ''tanmatra'' (purest unconjugated form) state, it does not possess taste. When it comes in contact with ''prithvi'', the taste is formed.  The variation in manifestation of six tastes like sweet, sour, salty, pungent, bitter and astringent is due to combination of other three ''mahabhuta'' like ''akasha, vayu'' and ''tejas''. [verse 64]  

* Classification of drugs based on ''prabhava'':  

* Classification of drugs based on ''prabhava'':  

''Rasa, guna, veerya'' and ''vipaka'' are important properties present in a ''dravya''. They can be identified by specific methods. But due to specific arrangements of ''mahabhutas'', which causes specific transformations, a ''dravya'' is possessing unique property termed as ''prabhava''. ''Mahabhutas'' being very subtle and unobservable with our senses, their conjugations or transformations can’t be readily understood. So ''prabhava'' is unexplicable. But it is understood based on the effects produced by it. Drugs can be classified on various parameters, based on ''prabhava'' also various classifications are possible. Here a gross classification based on three most important effects of ''prabhava'' is mentioned.

''Rasa, guna, veerya'' and ''vipaka'' are important properties present in a ''dravya''. They can be identified by specific methods. But due to specific arrangements of ''mahabhutas'', which causes specific transformations, a ''dravya'' is possessing unique property termed as ''prabhava''. ''Mahabhutas'' being very subtle and unobservable with our senses, their conjugations or transformations can’t be readily understood. So ''prabhava'' is unexplicable. But it is understood based on the effects produced by it. Drugs can be classified on various parameters, based on ''prabhava'' also various classifications are possible. Here a gross classification based on three most important effects of ''prabhava'' is mentioned.

* ''Dosha prashamana'' (''dosha'' pacifying): ''Dosha prashamana'' are the drugs which bring back the equilibrium of ''dosha''. ''Amalaki'' and ''durlabha'' pacify all the three ''dosha'' as well as correct the function of ''dhatu''. ''Amalaki'' pacifies ''vata'' due to ''madhura -amla'' ''rasa'' and ''madhura vipaka'', ''pitta'' due to ''madhura-tikta-kashaya'' , ''rasa'' and ''sheeta veerya'', ''kapha'' due to katu-tikta –kashaya rasa and guna like ruksha, laghu. This explanation of the mode of action of amalaki on three doshas is true. But question arises why with the same set of properties, different actions are not possible like vitiation of kapha with madhura-amla rasa, madhura vipaka and sheeta veerya. So there must be some other factor also influencing the actions. This factor is prabhava. The drugs with doshaprashamana prabhava always only pacify the doshas and never vitiate them, whereas the drugs with dhatu pradushana prabhava always vitiate, never pacify.

* ''Dosha prashamana'' (''dosha'' pacifying): ''Dosha prashamana'' are the drugs which bring back the equilibrium of ''dosha''. ''Amalaki'' and ''durlabha'' pacify all the three ''dosha'' as well as correct the function of ''dhatu''. ''Amalaki'' pacifies ''vata'' due to ''madhura -amla'' ''rasa'' and ''madhura vipaka'', ''pitta'' due to ''madhura-tikta-kashaya'' , ''rasa'' and ''sheeta veerya'', ''kapha'' due to ''katu''-''tikta –kashaya rasa'' and ''guna'' like ''ruksha, laghu''. This explanation of the mode of action of ''amalaki'' on three doshas is true. But question arises why with the same set of properties, different actions are not possible like vitiation of kapha with ''madhura-amla rasa'', ''madhura vipaka'' and ''sheeta veerya''. So there must be some other factor also influencing the actions. This factor is ''prabhava''. The drugs with ''doshaprashamana prabhava'' always only pacify the ''doshas'' and never vitiate them, whereas the drugs with ''dhatu pradushana prabhava'' always vitiate, never pacify.

* Dhatu pradushana (vitiating dhatu): There are some substances which by their very nature harm the body e.g. mandaka dadhi (immature curd/yogurt), slow and acute poisons etc.

* ''Dhatu pradushana'' (vitiating ''dhatu''): There are some substances which by their very nature harm the body e.g. ''mandaka dadhi'' (immature curd/yogurt), slow and acute poisons etc.

* Swasthavrittahita (maintaining health): The substances which help in maintaining, promotion and preservation of the health of the healthy persons are swasthavratta hitakara.  Rasayana and vajikarana as well as daily and seasonal regimens etc. are belonging to this group. Red rice, old rice, wheat, barley, green gram etc are good for daily use to maintain and promote health. The primary function of the substances under this category is to maintain the equilibrium of the dosha so that they are neither increased/aggravated nor decreased. Thus they help normal functioning of the body.  [verse 67]

* ''Swasthavrittahita'' (maintaining health): The substances which help in maintaining, promotion and preservation of the health of the healthy persons are ''swasthavratta hitakara''.  ''Rasayana'' and ''vajikarana'' as well as daily and seasonal regimens etc. are belonging to this group. Red rice, old rice, wheat, barley, green gram etc are good for daily use to maintain and promote health. The primary function of the substances under this category is to maintain the equilibrium of the ''dosha'' so that they are neither increased/aggravated nor decreased. Thus they help normal functioning of the body.  [verse 67]

* Ayurveda in general and Charaka in particular commonly use plant origin drugs. Animal origin drugs such as milk and its products are mainly used as diet articles and often as drugs also. As per present trend only cow’s urine is used that also mixed with herbal preparations as bhavana (fortification) or to make enema preparation strong particularly to combat ama conditions such as rheumatoid arthritis. Classical Ayurveda does not advise to use human urine. Other substances of animal origin are rarely used except shells of aquatic animals.  

* [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] in general and Charaka in particular commonly use plant origin drugs. Animal origin drugs such as milk and its products are mainly used as diet articles and often as drugs also. As per present trend only cow’s urine is used that also mixed with herbal preparations as ''bhavana'' (fortification) or to make enema preparation strong particularly to combat ''ama'' conditions such as rheumatoid arthritis. Classical [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] does not advise to use human urine. Other substances of animal origin are rarely used except shells of aquatic animals.  

* Samalah indicates byproducts such as bitumen. Salt, minerals and alkaline products obtained from earth are also included in this group. Minerals and metals obtained from earth are first subjected to purification and then converting to nano particles (bhasma) by the various methods described separately for each product. The metals are subjected to anaerobic incinerating processes to convert it into bhasma which is nano form of the metal. Thus the earth-products becomes free from side effects of the gross metal and very potent and cures many diseases when administered with specific decoctions. It also reduces the bulk of doses of the herbal substances when mixed with these bhasma. (Verse70).

* ''Samalah'' indicates byproducts such as bitumen. Salt, minerals and alkaline products obtained from earth are also included in this group. Minerals and metals obtained from earth are first subjected to purification and then converting to nano particles (''bhasma'') by the various methods described separately for each product. The metals are subjected to anaerobic incinerating processes to convert it into ''bhasma'' which is nano form of the metal. Thus the earth-products becomes free from side effects of the gross metal and very potent and cures many diseases when administered with specific decoctions. It also reduces the bulk of doses of the herbal substances when mixed with these ''bhasma''. (Verse70).

* Plant origin drugs are classified in four groups viz. vanaspati (direct fruiters), virudha (creepers), vanaspatya (flower-based fruiters) and aushadhi (herbs).  

* Plant origin drugs are classified in four groups viz. ''vanaspati'' (direct fruiters), ''virudha'' (creepers), ''vanaspatya'' (flower-based fruiters) and ''aushadhi'' (herbs).  

* Vanaspati (direct fruiters): There are some plants which bear fruits without visible flowers.  

* ''Vanaspati'' (direct fruiters): There are some plants which bear fruits without visible flowers.  

* Virudha (creepers): The plants which spread with branches are virudha e.g. guduchi

* ''Virudha'' (creepers): The plants which spread with branches are ''virudha'' e.g. ''guduchi''

* Vanaspatya (flower-based or flowering fruiters): The plants of this group bear first visible flowers and then fruits.

* ''Vanaspatya'' (flower-based or flowering fruiters): The plants of this group bear first visible flowers and then fruits.

* Aushadhi (herbs): The plants which die out after bearing the fruits are aushadha e.g. wheat, paddy, barley, lentils etc (Verse 71-72).

* ''Aushadhi'' (herbs): The plants which die out after bearing the fruits are ''aushadha'' e.g. wheat, paddy, barley, lentils etc (Verse 71-72).

* Fruits of both the types of klitaka (Glycyrrhiza glabra Linn.) are most useful for purgation, though Sushruta mentions use of its root generally. Only autumnal fruits of hastiparini are most useful. Sushruta advises use of leaves of aragvadha (Cassia fistula Linn.) for purgation but in the present context, its fruits are mentioned because they are useful (80-86).

* Fruits of both the types of ''klitaka'' (Glycyrrhiza glabra Linn.) are most useful for purgation, though Sushruta mentions use of its root generally. Only autumnal fruits of ''hastiparini'' are most useful. Sushruta advises use of leaves of ''aragvadha'' (Cassia fistula Linn.) for purgation but in the present context, its fruits are mentioned because they are useful (80-86).

* Ghee is the most important unctuous substance among various types of unctuous substances, because it possesses an unique quality of absorbing the properties of processed drugs without losing its own properties. Therefore ghee is the best media for processing drugs. (87-88).

* Ghee is the most important unctuous substance among various types of unctuous substances, because it possesses an unique quality of absorbing the properties of processed drugs without losing its own properties. Therefore ghee is the best media for processing drugs. (87-88).

* Saindhva (rock salt) is very useful among all salts, but here sauvarchala (sochal salt) is listed first because of its most palatable taste. Otherwise sochal salt comes only after saindhava in order of priority (89-92).

* ''Saindhva'' (rock salt) is very useful among all salts, but here ''sauvarchala'' (sochal salt) is listed first because of its most palatable taste. Otherwise sochal salt comes only after ''saindhava'' in order of priority (89-92).

* Urine from the female species of various animals have generally been advised for therapeutic purposes because they are considered light(Charaka Sutra 27/238). Some commentators ascribe heaviness to males with shukra and lightness of urine due to dissociation of female with shukra but it is not acceptable as females are not completely devoid of shukra dhatu. So in a nutshell, urine of female animals serves as efficacious in treating the many diseases. Next in order comes urine of male species. The urine of an impotent animal is considered inauspicious and thus not mentioned (93-105).

* Urine from the female species of various animals have generally been advised for therapeutic purposes because they are considered light(Charaka Sutra 27/238). Some commentators ascribe heaviness to males with ''shukra'' and lightness of urine due to dissociation of female with ''shukra'' but it is not acceptable as females are not completely devoid of ''shukra dhatu.'' So in a nutshell, urine of female animals serves as efficacious in treating the many diseases. Next in order comes urine of male species. The urine of an impotent animal is considered inauspicious and thus not mentioned (93-105).

* Sweetness, nourishment, unctuousness, and coolness are the general properties of the milk, but milk of some animals may differ in this regard. For instance, milk of she-camel is slightly saline in taste while she-goat is astringent. Similarly, milk of a she-camel also differs in properties as it is rough and hot. Hence the specific properties mentioned of the individual milk should also be considered in this regard (Charaka Sutra 27/217-224). Milk is beneficial for mental faculties due to its specific action and also due to its general nourishing property which includes the proper growth of the mental faculties also and not the mind itself which is eternal.  

* Sweetness, nourishment, unctuousness, and coolness are the general properties of the milk, but milk of some animals may differ in this regard. For instance, milk of she-camel is slightly saline in taste while she-goat is astringent. Similarly, milk of a she-camel also differs in properties as it is rough and hot. Hence the specific properties mentioned of the individual milk should also be considered in this regard (Charaka Sutra 27/217-224). Milk is beneficial for mental faculties due to its specific action and also due to its general nourishing property which includes the proper growth of the mental faculties also and not the mind itself which is eternal.  

* Milk is beneficial for certain states or conditions of raktapitta (bleeding disorders) as it is mentioned that even if after administration of the various decoctions, stimulation of digestive power and pacification of kapha. Raktapitta not cured indicates vata predominance and in such conditions the milk of a she-goat or of a cow, boiled with five times its volume of water is advised (Charaka Chikitsa 4:82-83). Thus, it is not correct to say that milk is harmful for adhoga and urdhvaga raktapitta due to laxative and kapha vitiating properties respectively. Milk is, of course, useful in raktapitta only at a certain stage (105-113).

* Milk is beneficial for certain states or conditions of ''raktapitta'' (bleeding disorders) as it is mentioned that even if after administration of the various decoctions, stimulation of digestive power and pacification of ''kapha''. ''Raktapitta'' not cured indicates ''vata'' predominance and in such conditions the milk of a she-goat or of a cow, boiled with five times its volume of water is advised (Charaka Chikitsa 4:82-83). Thus, it is not correct to say that milk is harmful for ''adhoga'' and ''urdhvaga raktapitta'' due to laxative and ''kapha'' vitiating properties respectively. Milk is, of course, useful in ''raktapitta'' only at a certain stage (105-113).

* Krishnagandha is included in the list of shodhana drugs though it has no elimination action. It seems this drug is included in the list owing to its external purification action and application as paste (116-119).

* ''Krishnagandha'' is included in the list of ''shodhana'' drugs though it has no elimination action. It seems this drug is included in the list owing to its external purification action and application as paste (116-119).

* Local people such as goat-herders, sheep-herders, cow-herder and other forest dwellers are generally well versed with identification of the local herbs. Therefore, the beginer may take their help of these people for identification of the plants available in their areas. However, mere knowing the name and form of the plant is not sufficient and one must know their pharmacological properties, therapeutic actions and underlying principle of its application. Hence the best physician is the one who is well acquainted with drugs in their entirely (120-123).

* Local people such as goat-herders, sheep-herders, cow-herder and other forest dwellers are generally well versed with identification of the local herbs. Therefore, the beginner may take their help of these people for identification of the plants available in their areas. However, mere knowing the name and form of the plant is not sufficient and one must know their pharmacological properties, therapeutic actions and underlying principle of its application. Hence the best physician is the one who is well acquainted with drugs in their entirely (120-123).

* To become a successful physician, it is very necessary to acquaint with identification of the drug material as well as to know detail pharmacological and therapeutic properties and actions of the drug.  

* To become a successful physician, it is very necessary to acquaint with identification of the drug material as well as to know detail pharmacological and therapeutic properties and actions of the drug.  

* Physician should use only those drugs which are well known from every aspect [pharmacological effect]. The unknown drug may act as poison and kill the patient. Therefore, if a physician knows all the three aspects viz., names, forms and properties of drugs can treat the patients successfully. Hence the patient should not take medicine from pseudo-physicians and similarly a physician should not prescribe a drug which is not well known (124-133).  

* Physician should use only those drugs which are well known from every aspect (pharmacological effect). The unknown drug may act as poison and kill the patient. Therefore, if a physician knows all the three aspects viz., names, forms and properties of drugs can treat the patients successfully. Hence the patient should not take medicine from pseudo-physicians and similarly a physician should not prescribe a drug which is not well known (124-133).  

* Correct drug and knowledgeable physician are the first two important pillars of successful treatment. Therefore, it is necessary to know the qualities of correct medicine and a good physician. The drugs having all the requisite properties and actions required for cure a particular disease is considered as the proper drug. For a good physician, it is necessary to have all the knowledge of the principles underlying the correct application of medicines. Sometimes a randomly prescribed medicine by a pseudo physician also succeed in alleviating a disease and in that case the credit is not his but it is just accidental. Thus, only that physician is best who has proficiency in the principle governing the use of drug, knows all the aspects of the medicine to select and thus has the capability of curing the diseases (134).

* Correct drug and knowledgeable physician are the first two important pillars of successful treatment. Therefore, it is necessary to know the qualities of correct medicine and a good physician. The drugs having all the requisite properties and actions required for cure a particular disease is considered as the proper drug. For a good physician, it is necessary to have all the knowledge of the principles underlying the correct application of medicines. Sometimes a randomly prescribed medicine by a pseudo physician also succeed in alleviating a disease and in that case the credit is not his but it is just accidental. Thus, only that physician is best who has proficiency in the principle governing the use of drug, knows all the aspects of the medicine to select and thus has the capability of curing the diseases (134).

* Ayurveda has a very scientific principle of ‘karya-karana vada’ which says every action (karya) has its specific cause (karana). Therefore, on the basis of this principle, if the disease is cured, it can be said that a proper medicine having all the requisite curative properties and action has been administered. Similarly, if there is a success in curing a disease, it also implies that the physician is proficient in Ayurveda and is endowed with all the good qualities as envisaged in Khuddaka chatushpada (Charaka Sutra l0/ 6) (135)

* [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] has a very scientific principle of ''karya-karana vada'' which says every action (''karya'') has its specific cause (''karana''). Therefore, on the basis of this principle, if the disease is cured, it can be said that a proper medicine having all the requisite curative properties and action has been administered. Similarly, if there is a success in curing a disease, it also implies that the physician is proficient in [https://en.wikipedia.org/wiki/Ayurveda Ayurveda] and is endowed with all the good qualities as envisaged in ''Khuddaka chatushpada'' (Charaka Sutra l0/ 6) (135)

* All over the world, plants are recognized by their scientific names (in Latin, mostly), and hence generally accepted Latin names of plants mentioned in this chapter are given here to facilitate their wide understanding.

* All over the world, plants are recognized by their scientific names (in Latin, mostly), and hence generally accepted Latin names of plants mentioned in this chapter are given here to facilitate their wide understanding.